ok need some help here. I was bought a tomtom 410 for b/day and Xmas , although I have a garmin!! Tried it out yesterday and once the bike is moving some access buttons, mainly the one to get the onscreen menu and + and - buttons on left side of screen become disfunctional so I can't bring up the menu whilst riding/driving. Now I'm assuming it's a safety feature but my garmin has the option to disable this. Anyone got any ideas?